SPS#1
With only using 0, 1 and 2, we want to make a string so that the difference between one symbol to the next or previous symbol is not more than one . for example we can make string 011221 and 2211010 , but we cannot make 102. how many string could be made , if it was 10 digit long ? please post a solution :)
The answer is 8119.
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